Comment 5 for bug 1878626

First attempt at an instrumented reproducer did not reproduce the issue.

Steps taken:

  - deployed a charm on LXD provider with modified layer-basic with increased verbosity
  - changed the firewall rules to only allow communication between juju controller and unit
  - issued a charm upgrade

All wheels were sourced from the local whelhouse with file:// links and I saw now network related errors.

It may be the initial install has brought something to the system that make it not display the behavior on charm upgrade, so I'll do another attempt where the initial deploy is also isolated.